TIKA-4721: Validate port range from READY signal

Throw IOException if the server reports a port outside [1, 65535]
to catch any malformed or out-of-range values early.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: nddipiazza

tika-pipes/tika-pipes-core/src/main/java/org/apache/tika/pipes/core/SharedServerManager.java

@@ -334,7 +334,11 @@ private int waitForServerReady() throws IOException, ServerInitializationExcepti
                     String line = reader.readLine();
                     if (line != null && line.startsWith("READY:")) {
                         String portStr = line.substring("READY:".length()).trim();
-                        return Integer.parseInt(portStr);
+                        int port = Integer.parseInt(portStr);
+                        if (port <= 0 || port > 65535) {
+                            throw new IOException("Server reported invalid port: " + port);
+                        }
+                        return port;
                     }
                 } else {
                     // No data available, sleep briefly